:root {
    --primary-color: #3B82F6;
    --primary-dark: #2563EB;
    --primary-light: #60A5FA;
    --text-primary: #1F2937;
    --text-secondary: #4B5563;
    --background-light: #F9FAFB;
    --background-white: #FFFFFF;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-light);
}

/* Navigation */
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--background-white);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: calc(var(--spacing-xl) * 2) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    text-align: center;
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.subtitle {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.9;
}

.description {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.8;
}

/* Buttons */
.cta-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.primary-button, .secondary-button {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
}

.primary-button {
    background-color: white;
    color: var(--primary-color);
}

.primary-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.secondary-button {
    border: 2px solid white;
    color: white;
}

.secondary-button:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* Features Section */
.features {
    padding: var(--spacing-xl);
    background-color: var(--background-white);
}

.features h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 2.5rem;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    padding: var(--spacing-lg);
    background-color: var(--background-light);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.feature-card ul {
    list-style: none;
    color: var(--text-secondary);
}

.feature-card li {
    margin-bottom: var(--spacing-xs);
    position: relative;
    padding-left: var(--spacing-md);
}

.feature-card li::before {
    content: "•";
    color: var(--primary-color);
    position: absolute;
    left: 0;
}

/* Benefits Section */
.benefits {
    padding: var(--spacing-xl);
    background-color: var(--background-light);
}

.benefits h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 2.5rem;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.benefit-item {
    text-align: center;
    padding: var(--spacing-lg);
}

.benefit-item h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.benefit-item p {
    color: var(--text-secondary);
}

/* Scenarios Section */
.scenarios {
    padding: var(--spacing-xl);
    background-color: var(--background-white);
}

.scenarios h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 2.5rem;
}

.scenario-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.scenario-card {
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease;
}

.scenario-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.scenario-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.scenario-card h3 {
    padding: var(--spacing-md);
    margin: 0;
    background-color: var(--background-white);
}

.scenario-card p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-secondary);
}

/* Start Section */
.start-section {
    text-align: center;
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.start-section h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.start-section p {
    margin-bottom: var(--spacing-lg);
    font-size: 1.25rem;
    opacity: 0.9;
}

/* Footer */
footer {
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-links {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.footer-column h4 {
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    margin-bottom: var(--spacing-sm);
    transition: color 0.2s ease;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .features-grid,
    .benefits-grid,
    .scenario-cards {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-logo {
        justify-content: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}
